Method for making a part of composite material with ceramic...

C - Chemistry – Metallurgy – 04 – B

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Details

C04B 35/571 (2006.01) C04B 35/628 (2006.01) C04B 35/80 (2006.01) C04B 41/45 (2006.01) C04B 41/50 (2006.01) C04B 41/52 (2006.01)

Patent

CA 2598223

The invention concerns a method whereby an intermediate phase coating is formed by chemical vapour infiltration (CVI) on the fibers constituting a fibrous preform, the intermediate phase coating comprising at least one internal embrittlement relief layer of the composite material, in contact with the fibers, and an external adherence layer with the ceramic matrix. The fibrous preform is then maintained in its shape with the fibers provided with an intermediate phase coating, and reinforced by being impregnated with a liquid composition containing a ceramic precursor, and transformation of the precursor into a reinforcing phase of ceramic matrix. The reinforced preform is then densified by a complementary ceramic matrix phase. No maintenance tools are required for forming the intermediate phase coating by CVI or for densifying after reinforcement by liquid process.

Un revêtement d'interphase est formé par infiltration chimique en phase vapeur (CVI) sur les fibres constitutives d'une préforme fibreuse, le revêtement d'interphase comportant au moins une couche interne de défragilisation du matériau composite, au contact des fibres, et une couche externe d'adhérence avec la matrice céramique. La préforme fibreuse est ensuite maintenue dans sa forme avec les fibres munies du revêtement d'interphase, et consolidée par imprégnation par une composition liquide contenant un précurseur de céramique, et transformation du précurseur en une phase consolidante de matrice céramique. La préforme consolidée est ensuite densifiée par une phase complémentaire de matrice céramique. Aucun outillage de maintien n'est nécessaire pour la formation du revêtement d'interphase par CVI ou pour la densification après consolidation par voie liquide.

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